US3919493A - Telephone ringing circuit - Google Patents

Telephone ringing circuit Download PDF

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Publication number
US3919493A
US3919493A US476064A US47606474A US3919493A US 3919493 A US3919493 A US 3919493A US 476064 A US476064 A US 476064A US 47606474 A US47606474 A US 47606474A US 3919493 A US3919493 A US 3919493A
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United States
Prior art keywords
capacitor
transducer
switch
circuit
frequency
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Expired - Lifetime
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US476064A
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English (en)
Inventor
Jean-Michel Person
Gerard J P Pays
Jean-Michel A Garnier
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
GARNIER JEAN MICHEL A
PERSON JEAN MICHEL
Original Assignee
GARNIER JEAN MICHEL A
PERSON JEAN MICHEL
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M19/00—Current supply arrangements for telephone systems
    • H04M19/02—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone
    • H04M19/04—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone the ringing-current being generated at the substations

Definitions

  • ABSTRACT The switch may be a thyristor and the electro-acoustic transducer may be a loudspeaker.
  • This device permits the subscriber to adjust the frequency and the sound level of the telephone ringing.
  • the present invention relates to a telephone ringing system capable of converting an electric alternating low-frequency signal, such as a signal with a frequency lower than or equal to 50 Hz, into a more audible sound signal capable of being transmitted to a small transducer.
  • the consumption of electric power is relatively high; also since it is necessary to move metal parts, most of the required energy is lost due to friction or the Joule effect.
  • the efficiency of these telephone ringers which is given by the ratio between the radiated acoustic power and the consumed electric power, is generally lower than one thousandth.
  • the dimensions of thesound source become of importance if a great acoustic efficiency is required or if a signal having low frequencies is desired, especially since such frequencies give a more pleasant tonality and are more easily propagated through partitions of houses or buildings.
  • the sound level and frequency cannot be readily adjusted, the frequency in particular depending upon the characteristic frequencies of the resonators.
  • Another known device in the prior art comprises an electro-acoustic ring for telephone systems which uses the current of the call signal transmitted through the line. This signal is rectified in order to be applied to a transistor which controls a loud-speaker, this transistor being alternatively switched to the frequency of the call signal by the half-waves of this signal.
  • a call device comprising an electro-mechanic transducer.
  • the current of the call signal is rectified and charges a capacitor which discharges into the coil of a transducer controlled by a thyristor. This in turn is controlled by a circuit which is series-connected to the capacitor and the coil.
  • an electro-acoustic call device comprising a special electro-acoustic microphone.
  • This microphone is energized by a low frequency oscillator having an oscillating circuit which comprises the coil of the microphone and a capacitor.
  • a telephone ringing comprising a rectifier for an alternating call signal, an energy storing circuit including a capacitor fed by the rectifier, a switch series-connected to the capacitor and a transducer in such a manner as to form a discharge circuit for the capacitor when the switch is closed, and an electronic acoustic frequency oscillator fed by the rectifier which controls at its own frequency the switching of the switch.
  • the device according to the invention can be considered as comprising three circuits:
  • the first circuit is designed to rectify the alternating current of the call signal in order to suitably feed the electronic circuits carrying out other functions.
  • the second circuit withdraws from-the obtained direct current source a determined amount of power which is nearly constant and is designed to store energy that can be then suddenly released at a desired time in the transducer.
  • the third circuit produces the timed signal which controls the generation in the transducer, in the form of short pulses, of the energy progressively stored by the second circuit.
  • FIG. 1 is a block diagram of an electro-acoustic device
  • FIG. 2 shows an embodiment of the rectifying circuit of the device shown in FIG. 1;
  • FIG. 3 shows an embodiment of the circuit storing the energy of the device of FIG. 1;
  • FIG. 4 shows an embodiment of the electro-acoustic device of FIG. 1.
  • an alternating call signal is applied to terminals 11 and 12 of a rectifying device 1.
  • the latter feeds an energy storing device 2 and an oscillator 3.
  • This oscillator controls at a desired rate a switch 4 which allows the electric energy of the device 2 to be released and applied to the electro-acoustic transducer 5.
  • the switch 4 is preferably an electronic switch, which avoids all movement of any elements except the moving membrane of the transducer.
  • This transducer can be a loudspeaker.
  • the embodiments of the various circuits can vary depending upon the results desired by the user as far as the sound level, the spectrum composition, adjustment possibilities etc., are concerned.
  • the efficiency is satisfactory when the radiated acoustic power is of the order of 1 milliwatt.
  • the sonority is satisfactory when the pulses applied to the transducer are regularly spaced from one another with a period ranging from 0.5 to 4 milliseconds and have a uniform amplitude; actually it is of no use for comfort and efficiency to vary the instantaneous amplitude or frequency by means of a perceptible frequency modulation. It is important instead for the user to be in a position of adjusting the sound level radiated by the transducer.
  • the rectifying circuit 1 of FIG. 1 is based on the known features of voltage doubler of the arrangement shown in FIG. 2.
  • This arrangement is particularly suitable for telephone exchanges. It comprises two diodes 112 and 113 and two capacitors 111 and 114.
  • the capacitor 111 prevents the DC. supply voltage of the exchange from emitting the sound signal.
  • the DC. voltage across 13 and 14 is equal to twice the amplitude of the alternating call signal.
  • the capacitor 114 filters the alternating components resultiung from the rectification.
  • FIG. 3 is a diagram of the energy storing circuit 2 of FIG. 1.
  • a capacitor 221 is charged by a constant current supplied thereto by a transistor 222, a Zener diode 223 and resistors 224 and 225.
  • the current charging the capacitor is approximately given by the relationship:
  • V is the voltage across the terminals of the diode V,,,,- is the voltage drop across the emitter-base circuit of the transistor T in the conducting state;
  • R is the value of the resistor 225 connected to the emitter of the transistor 222.
  • FIG. 4 illustrates a complete arrangement of a preferred embodiment of the invention.
  • the blocks 1, 2, 3, 4, 5, of the diagram of FIG. 1 can be seen similarly referenced.
  • the switch 4 is a thyristor switch.
  • the current I supplied by the current generator comprising the elements 222 to 225 charges the capacitor 221 and then flows to the transducer and the diode 31 of the oscillator 3.
  • the diode 31 which is of the Zener diode type, there also appears a constant voltage U which is designed to charge the capacitor 33 via the resistor 32.
  • the voltage across the terminals of capacitor 33 increases with time and reaches a level sufficient for rendering the transistor 34 conducting. The latter then absorbs a part of the current I and causes a current to flow through the resistors 36 and 37 in its collector-emitter circuit.
  • the thy ristor 4 When the voltage across the terminals of 36 reaches a sufficient value, the thy ristor 4 suddenly becomes conducting and allows the capacitor 221 to be discharged across the transducer 5 through the thyristor circuit 4, diode 31, transducer 5, and capacitor 221. Said discharge current also flows through the diode 31 across the terminals of which there occurs a voltage of opposite sign and of a value much lower than the voltage U This causes the capacitor 33 to be discharged through the base-emitter circuit of the transistor 34. Upon the end of the discharge of the capacitor 221, capacitor 33 is discharged. The switch 4 becomes non-conducting again and the same cycle can re-start.
  • the frequency of the control pulses of the switch 4 in a first approximation depends exclusively upon U the control voltage of the thyristor 4 and the values of the elements 32, 33, 36, 37.
  • the energy of the pulses applied to the transducer 5 depends only upon the current flowing through transistor 22, i.e.: I.
  • the variable resistor 225 upon which I depends allows the energy of the pulses to be varied independently of the frequency; this causes the acoustic power of the generated signal to be varied without changing its frequency or its tone.
  • the resistor 8 the value of which does not substantially modify the performance of the device, improves its operational stability.
  • a ringing device in a telephone subset comprising:
  • a rectifier having positive and negative output terminals for rectifying the current of said source
  • said switch, capacitor, and transducer constituting a circuit for discharging said capacitor through said electronic switch when in its closed state whereby the energy of said capacitor is transferred to said transducer.
  • a ringing device as claimed in claim 1 further comprising a voltage divider having two serially connected resistances connected across said oscillator and wherein said electronic switch is provided with a gate, the gate of said switch being connected to the junction point of said serially connected resistances.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Devices For Supply Of Signal Current (AREA)
  • Mobile Radio Communication Systems (AREA)
US476064A 1973-06-28 1974-06-03 Telephone ringing circuit Expired - Lifetime US3919493A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7323710A FR2235556B1 (enrdf_load_stackoverflow) 1973-06-28 1973-06-28

Publications (1)

Publication Number Publication Date
US3919493A true US3919493A (en) 1975-11-11

Family

ID=9121721

Family Applications (1)

Application Number Title Priority Date Filing Date
US476064A Expired - Lifetime US3919493A (en) 1973-06-28 1974-06-03 Telephone ringing circuit

Country Status (4)

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US (1) US3919493A (enrdf_load_stackoverflow)
DE (1) DE2427042C3 (enrdf_load_stackoverflow)
FR (1) FR2235556B1 (enrdf_load_stackoverflow)
GB (1) GB1473878A (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5172408A (en) * 1990-08-01 1992-12-15 At&T Bell Laboratories Speakerphone state-controlled alerting arrangement

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE435777B (sv) * 1979-01-29 1984-10-15 Ibuki Kogyo Co Ltd Elektriskt horn
GB2071963B (en) * 1979-08-20 1983-07-27 Western Electric Co Electronic toner ringer

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3471651A (en) * 1967-01-13 1969-10-07 Ibm Telephone ringing circuit
US3536852A (en) * 1969-01-23 1970-10-27 Lorain Prod Corp Telephone interruption switching circuitry
US3539732A (en) * 1967-03-18 1970-11-10 Carlos Weissenberg Electronic system for signaling the entrance of telephone calls in multiline telephone sets
US3603740A (en) * 1969-08-18 1971-09-07 Northern Electric Co Method and means for ringing a telephone subset
US3688038A (en) * 1971-04-12 1972-08-29 Stromberg Carlson Corp Stored energy signalling circuit

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1581035A (enrdf_load_stackoverflow) * 1968-07-08 1969-09-12

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3471651A (en) * 1967-01-13 1969-10-07 Ibm Telephone ringing circuit
US3539732A (en) * 1967-03-18 1970-11-10 Carlos Weissenberg Electronic system for signaling the entrance of telephone calls in multiline telephone sets
US3536852A (en) * 1969-01-23 1970-10-27 Lorain Prod Corp Telephone interruption switching circuitry
US3603740A (en) * 1969-08-18 1971-09-07 Northern Electric Co Method and means for ringing a telephone subset
US3688038A (en) * 1971-04-12 1972-08-29 Stromberg Carlson Corp Stored energy signalling circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5172408A (en) * 1990-08-01 1992-12-15 At&T Bell Laboratories Speakerphone state-controlled alerting arrangement

Also Published As

Publication number Publication date
FR2235556A1 (enrdf_load_stackoverflow) 1975-01-24
GB1473878A (en) 1977-05-18
FR2235556B1 (enrdf_load_stackoverflow) 1978-09-08
DE2427042B2 (de) 1977-08-18
DE2427042A1 (de) 1975-01-30
DE2427042C3 (de) 1978-04-13

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